Baetidae (Blue-Winged Olives) Mayfly Nymph Pictures

Mayflies

Caddisflies

Stoneflies

Classification

Kingdom Animalia (Animals)

» Phylum Arthropoda (Arthropods)

» Class Insecta (Insects)

» Order Ephemeroptera (Mayflies)

» Family Baetidae (Blue-Winged Olives)

Here's a rather different tiny Baetid nymph. The tails are all unbanded, and the tergites (

One tergite of this Isonychia bicolor mayfly spinner is highlighted in red.

Tergite: The top (dorsal) part of a single segment on an insect's abdomen when it consists of a single chitinous plate (sclerite), or an individual sclerite if the segment has more than one.) all have a dark-colored anterior (Anterior: Toward the front of an organism's body. The phrase "anterior to" means "in front of.") 2/3 and light-colored posterior (Posterior: Toward the back of an organism's body. The phrase "posterior to" means "in back of.") 1/3. The gill veinlets (Veinlet: Short insect wing veins connecting the major longitudinal veins to the wing margin.) are indistinct. It's probably a very early instar (Instar: Many invertebrates molt through dozens of progressively larger and better-developed stages as they grow. Each of these stages is known as an instar. Hard-bodied nymphs typically molt through more instars than soft-bodied larvae.) of some Baetis species.

This mayfly was collected from unknown on January 31st, 2004 and added to Troutnut.com on January 25th, 2006.

Shown Full Size

Baetidae (Blue-Winged Olives) Mayfly Nymph from unknown in Wisconsin

AuthorTroutnut

CameraOlympus C740UZ

Shown Full Size

AuthorTroutnut

CameraOlympus C740UZ

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Jargon Defined:

Anterior: Toward the front of an organism's body. The phrase "anterior to" means "in front of."

Instar: Many invertebrates molt through dozens of progressively larger and better-developed stages as they grow. Each of these stages is known as an instar. Hard-bodied nymphs typically molt through more instars than soft-bodied larvae.

Nymph: The juvenile, underwater stages of mayflies, stoneflies, dragonflies, and damselflies and other aquatic insects whose juvenile stages are covered by hard exoskeletons. The word can also refer to the fishing flies which imitate these creatures, in which case it is used as a blanket term for flies imitating any underwater stage of an invertebrate (except for crayfish and leeches).

Posterior: Toward the back of an organism's body. The phrase "posterior to" means "in back of."

One tergite of this Isonychia bicolor mayfly spinner is highlighted in red.

Tergites: The top (dorsal) part of a single segment on an insect's abdomen when it consists of a single chitinous plate (sclerite), or an individual sclerite if the segment has more than one.

Veinlets: Short insect wing veins connecting the major longitudinal veins to the wing margin.